Provides centralised, named palettes used across margot plotting functions. The "lab" palette is intended for LMTP positivity/overlap plots and includes explicit colours for common shift names (cleaned suffixes), including `null`, `shift_zero`, and `ipsi_` variants (e.g., `ipsi_02`, `ipsi_05`, `ipsi_10`).
Usage
margot_palette(name = c("lab", "classic"))